Photochromic Dye Intermediate Indoline from China
1,3,3-Trimethyl-2-methyleneindoline serves as a photochromic dye intermediate explicitly listed in HTS 2933.99.08.00. This nitrogen-heterocyclic compound reacts with spiropyrans to create color-changing materials for lenses and inks. Its aromatic indoline structure defines its Chapter 29 classification.
Duty Rate — China → United States
12.5%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Include intended end-use declaration specifying dye intermediate function
• Provide stability data showing no inherent color (distinguishing from Chapter 32)